<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       li {
           width: 30px;
           height: 30px;
           border: 1px solid pink;
           text-align: center;
           line-height: 30px;
           list-style: none;
           float: left;
           margin: 10px;
           border-radius: 50%;
           /*1鼠标变成小手 */
           cursor: pointer;
           /* 3配合过渡0.4秒 */
           transition: all .4s; 
       }
       li:hover {
           /* 2鼠标经过li等比例放大1.2倍 */
           transform: scale(1.2);
          
       }
    </style>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
    </ul>
</body>
</html>